package sizeyunsuan2;

import java.io.IOException;

public class Wenjian {

    public static void main(String[] args) {

        Biaodashi pra = new Biaodashi();

        try {

            pra.outFile("Expression.txt","Practice.txt");

        }catch (IOException e){

            System.out.println(e);

        }

    }

}


